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4*(-5)+15=-5
-20+15=-5
-5=-5
L=P spełnia
b)
m+5=-10
-5+5=-10
0=-10 nie spełnia
c)
2*(-5)-7=4*(-5)+3
-10-7=-20+3
-17=-17
L=P spełnia
zad.2
a)
x+6=8
x=8-6
x=2
b)
10+x=10
x=10-10
x=0
c)
x-2=-3
x=-3+2
x=-1
d)
-20+x=-10
x=-10+20
x=10